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export function isValidPort(port: number) {  // verify if port is a number.  if (typeof port !== "number" || isNaN(port)) {    return false;  }  // port cannot be negative.  if (port <= 0) {    return false;  }  const minPort = 1;  const maxPort = 65535;  // Verify if port is in range.  return port >= minPort && port <= maxPort;}
/** * Validate a bucket name. * http://docs.aws.amazon.com/AmazonS3/latest/dev/BucketRestrictions.html */export function isValidBucketName(bucket: string) {  if (typeof bucket !== "string") {    return false;  }
  // bucket length should be less than and no more than 63  // characters long.  if (bucket.length < 3 || bucket.length > 63) {    return false;  }  // bucket with successive periods is invalid.  if (bucket.indexOf("..") > -1) {    return false;  }  // bucket cannot have ip address style.  if (bucket.match(/[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+/)) {    return false;  }  // bucket should begin with alphabet/number and end with alphabet/number,  // with alphabet/number/.- in the middle.  if (bucket.match(/^[a-z0-9][a-z0-9.-]+[a-z0-9]$/)) {    return true;  }  return false;}
/** * check if objectName is a valid object name * http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingMetadata.html */export function isValidObjectName(objectName: string) {  if (!isValidPrefix(objectName)) return false;  if (objectName.length === 0) return false;  return true;}
// check if prefix is validexport function isValidPrefix(prefix: string) {  if (typeof prefix !== "string") return false;  if (prefix.length > 1024) return false;  return true;}
/** * Convert some binary data to a hex string */export function bin2hex(binary: Uint8Array) {  return Array.from(binary).map((b) => b.toString(16).padStart(2, "0")).join(    "",  );}
export function sanitizeETag(etag = "") {  const replaceChars: Record<string, string> = {    '"': "",    "&quot;": "",    "&#34;": "",    "&QUOT;": "",    "&#x00022": "",  };  return etag.replace(    /^("|&quot;|&#34;)|("|&quot;|&#34;)$/g,    (m) => replaceChars[m],  );}
export function getVersionId(headers: Headers): string | null {  return headers.get("x-amz-version-id") ?? null;}
/** Create a Date string with format: 'YYYYMMDDTHHmmss' + Z */export function makeDateLong(date?: Date) {  date = date || new Date();
  // Gives format like: '2017-08-07T16:28:59.889Z'  const dateStr = date.toISOString();
  return dateStr.substr(0, 4) +    dateStr.substr(5, 2) +    dateStr.substr(8, 5) +    dateStr.substr(14, 2) +    dateStr.substr(17, 2) + "Z";}
/** Create a Date string with format: 'YYYYMMDD' */export function makeDateShort(date?: Date) {  date = date || new Date();
  // Gives format like: '2017-08-07T16:28:59.889Z'  const dateStr = date.toISOString();
  return dateStr.substr(0, 4) + dateStr.substr(5, 2) + dateStr.substr(8, 2);}
export function getScope(region: string, date: Date) {  return `${makeDateShort(date)}/${region}/s3/aws4_request`;}
export async function sha256digestHex(data: Uint8Array | string) {  if (!(data instanceof Uint8Array)) {    data = new TextEncoder().encode(data);  }  return bin2hex(new Uint8Array(await crypto.subtle.digest("SHA-256", data)));}